Re: Battery tag spot welder.
Nice project. I've been planning on building one myself for the same application (welding battery terminals) for a while now and got as far as sourcing and modifying the transformer. Like you I removed the secondary with a hacksaw and hammer. I also removed the shunts, and re-wound with two turns of 10mm2 copper. Your project is encouraging me to get on with finishing my own version.
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